David Taylor 0188d53f3a
DEV: Add performance warning message when running rails s (#12912)
In Discourse, `rails s` ultimately launches the `bin/unicorn` script. However, the overhead of `rails` launching `bin/rails`, and then in turn `bin/unicorn` can be non-trivial. Therefore it is much better to run `bin/unicorn` directly.

This commit prints a warning message to STDERR when `rails s` is used. Functionality is unchanged.
2021-04-30 11:50:06 +01:00
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